When compiling ghc-6.4.20050211 with itself, I get : /usr/local/bin/ghc -M -optdep-f -optdep.depend -osuf o -H16m -O -i../../lib/compat -Rghc-timing -Wall Main.hs ../../lib/compat/Compat/RawSystem.hs:19: ../../includes/ghcconfig.h: No such file or directory I verified the version of ghc : /usr/local/bin/ghc --version The Glorious Glasgow Haskell Compilation System, version 6.4.20050211 Alain